diff --git a/AbstractUriElement.php b/AbstractUriElement.php
index c0b76ca..9a3712b 100644
--- a/AbstractUriElement.php
+++ b/AbstractUriElement.php
@@ -18,20 +18,9 @@
  */
 abstract class AbstractUriElement
 {
-    /**
-     * @var \DOMElement
-     */
-    protected $node;
-
-    /**
-     * @var string|null The method to use for the element
-     */
-    protected $method;
-
-    /**
-     * @var string The URI of the page where the element is embedded (or the base href)
-     */
-    protected $currentUri;
+    protected \DOMElement $node;
+    protected ?string $method;
+    protected ?string $currentUri;
 
     /**
      * @param \DOMElement $node       A \DOMElement instance
diff --git a/Crawler.php b/Crawler.php
index 15773f4..be56712 100644
--- a/Crawler.php
+++ b/Crawler.php
@@ -23,10 +23,7 @@
  */
 class Crawler implements \Countable, \IteratorAggregate
 {
-    /**
-     * @var string|null
-     */
-    protected $uri;
+    protected ?string $uri;
 
     /**
      * The default namespace prefix to be used with XPath and CSS expressions.
diff --git a/Field/FormField.php b/Field/FormField.php
index 54fe3bb..f364d52 100644
--- a/Field/FormField.php
+++ b/Field/FormField.php
@@ -18,30 +18,12 @@
  */
 abstract class FormField
 {
-    /**
-     * @var \DOMElement
-     */
-    protected $node;
-    /**
-     * @var string
-     */
-    protected $name;
-    /**
-     * @var string
-     */
-    protected $value;
-    /**
-     * @var \DOMDocument
-     */
-    protected $document;
-    /**
-     * @var \DOMXPath
-     */
-    protected $xpath;
-    /**
-     * @var bool
-     */
-    protected $disabled;
+    protected \DOMElement $node;
+    protected string $name;
+    protected string|array|null $value = null;
+    protected \DOMDocument $document;
+    protected \DOMXPath $xpath;
+    protected bool $disabled = false;
 
     /**
      * @param \DOMElement $node The node associated with this field